Hello Gregory
If the packages are FFI-free they "should just work" (ahem, perhaps
with some caveats about e.g. file paths - if they have data files
included).
If they have FFI dependencies then a Windows emulator is going to have
to emulate Unix in turn (either via MinGW or Cygwin). It might be more
productive to simply label them as "Untested under Windows" and make a
reference to the FFI dependencies.
Best wishes
Stephen